Pneumatic paintbrush



Patente-d Nov. `3, 1925.

UNITED- STATES 1,559,796 PATENT OFFICE'.

FREDERICK W. SCHNEIDER, UF BALTIMORE. MARYLAND, ASSIGNOR TO PITTSBURGH PLATE GLASS COMPANY, A CORPORATION OF PENNSYLVANIA.

A PNEUMATIC PAINTBnUssI.

.Application filed December 5, 1923. Serial No. 678,591.

To a?! 'Lehm/ i 'it muy concern.'

Be it known that I, Fnnnnnieii W. @onvinnnn, a citizen ot the United Statesy and a resident of Baltimorer` in the county of Baltimore City and State of Maryland, have made a new and 'useful invention in improvements in a Pn'eun'iatic Paintbrush. of which the following is a spcciication.

The invention relates to pneumatic paint brushes or guns and has for its principal objects the provision of a construction having improved means for regulating the Width of the spray when such spray is of the dat type, and having improved operating mechanism for the air and paint valves intermediate such valves-and the trigger. A. further object is the provision ot' improved means for varying the area or the air discharge opening at the center oi the nozzle.

One embodiment ot the invention is illustrated 1n the accompanylng drawlng's, wherein:

Figure 1 is a vertical section through the device. Fig. 2 is a plan view. Fig. 3 is an end View of the head ot the device. AAnd Fig. 4 is a series of detail views of the trigger member.

Referring to the drawingsv` 1 is the hotly portion of the gun provided with the handle pieces 2 held on bj" screws and having a transverse recess extending clear through the body portion and longitudinally there- Above the recess 3 is a passage 4 in which is slidahlv mounted the tube for operating the valve This valve is normally held closed by the spring 7 and has a tinted stem S adapted to he engaged by the plate 9 set cdgowise in the end ot' the tube 'lhe recess 2 is'provided with a liner 10 which carries the triggery member 11. such member being .slidable longitudinally in the liner. The recess 3 is closed at the sides by suitable cap members (not shown) which engage the edges of the liner and are held together by a screw. The tube 5 is connected with the-trigger member 11 b v means oi' the downwardl)v projecting pin 12 Which is screwed into the tube.' The trigger member also 'operates the valve 13 controlling` the' supply of paint through the head. This v aivc is provided witha rearwardly project ing stem 14 passing through the stning box 15 and into the tigger member 11. The rear end of this Stem is screw threaded and carries the nuts 16 and 17; one of which acts as a lock nut. y

The trigger member 11 is preferably made hollow as illustrated, and provided with the pair o't' slots 18 and 19, the slot 1S receiving" the. pin` 12, while the slot, 19 receives the stem 14 of the paint valve. The use ot these slots iu conjunction with the hollow trigger member lprovides a convenient means i'or assembling and lhs; anbling the parts. and whenthe cover plates for the recess I3 are removed, access is given to the nuts 16 and 1T lfor adjusting thc valve 13.

The head 2O ot vthe device -is provided with a removable nozzle 2l. in which the valve 18 seats. the valve being heldin forw'ard position bj' means ot the spring;l Q2. A lost motion connection is'provided between the trigger member and the nuts l0 and 17, so that in operating the trigger i member, the air valve controlled by 'the tube 5 is opened 1n advance of the opening ot the paint valves-.ind the paintvalve is' closed in advance ofthe air valve. Paint is supplied to the passageway 23 from the pipe 24 to which a patint receptacle or paint let. the annular space 2T hack ot' such disc being supplied Jfrom the air passage :28. The ilow through this air' passage is regulated h v means ot' the screw Q9 held in adjusted position hv means o't the4 lock nut 30. The apparatus is provided with a plurality of discs 25 having orifices 26 of dierent dia'meters so that the quantity of air forced through the. nozzle may be varied to meet requirements. The end of the head is made inconical form as indicated inv` Fig. 1 and provided with two pair of supplemental air passages 31 'and 325 such pairs fof passages being arranged at degrees from each other. Secured for rot-ary adjustment upon the conical head is the cap such cap being clamped in position b v means of the flanged nut 8T. The cap is provided with three pairs` ot passages 34, 35 and 36 of different diameter as indicated in Fig. 3 and any one of these airs of passages may be made to register with the passages 31 or 32 so that the supply of air transversely of spray maybe variedtoi meet requirements and this result is accomplished without the necessity of changing'the head. fWhen it is desired to use a round spray instead of a flat one, the cap 33 is rotated so that the passages A3l and' 32 are' out of'I registration with any of the passages 34, 35and 36 of the cap..

What I claim-is: 1.- In combination in an air brush, a body provided-.with a head having at its center` concentric air and aint discharge `passages y and a. pair of supp emental air passages en opposite sides of said passages, and a cap. mounted for rotary adjustment on the headA and provided with a plurality of pairs of passages of 3 different diameters directed transversely of the passages' at the center ot' the head and adapted to register successively.

at their inner ends with said supplemental air` passages in the head, as the cap is rotated `from one position-of adjustment to another. ,1 l Y 2. In combination in an air brush, a body provided with a head having at its @enter roncentricair and paint discharge passages anda pair of supplemental air passages on opposite sides of said passages, a cap mount ed for rotary adjustment on the head and provided with a pair of oppositely disposed passages directed transversely ot' the passages at the center of the head and adapted to register at theirinner ends With said supplemental air passages, and a removable perlorateddisc screw threaded into the head and constituting the orifice ot said air passage atthe center of the head.

3. In combination in an air brush, a body portion provided with a paint and air discharge headfa guide recess back of thehcad in line therewith and an air supply passage extending longitudinally of the body above said guide Vrecess, a valve controlling the flow of air through said air supply passage, an operating member for the valve slidably mounted in said air passage, 'a paint controlling valve in the head having a. stem extending rearwardly into said guide recess, and a trigger member slidably mounted in aid recess and having connection-,With said imerating member and said stem.

4. In combination in an airbrush, a body portion provided with a paint and air discharge head, a. guide recess back of the head in line therewith and an air supply passage extending longitudinally ot' the vbody above said guide recess, a valve controlling the loW o air through said air supply passage, an operating member for the valve slid-ably niountedin said air passage, and having a pin. projecting into, said recess, a paint controlling'valve in the head having a stem extending rearwardly into said recess, and a hollow trigger member slidably mounted in said recess and having a pair of transverse slots receiving saidpin and stem, the stein being provided with an. adjusting nut located inside the trigger member. 5. In combination in an air brush, a head having central :vint and air discharge passages, and a pair of air sup-ply pai" ges on opposite sides ot' the discharge passage at 18() degree from `cach other, and a cap mounted l'or rotary adjustment on the head and provided with a plurali-ty ot' pairs of discharge passages ot' different diameters adapted to register with the first pair and vwiththe members of each. pair at 180 degrees from each other and directed transversely of the central passages. l j y 6. In combination in an air brush, a body portion provided with a head having air and paint discharge nozzles, a central paint supply passage, a transverse passage leading into said passage, and a longitudinalpassage leading to the air nozzle above the central passage, an admission valve for controlling the supply of air to said longitudinal passage, an operating member slidably mounted in said longitudinal passage, a controlling valve for the paint nozzle movable longitudinally oi said central passage, a triffgrr member slidably minmtcd in the bof. f portion beneath said operating member for movement longitiulinally ot the body portion and connections between said trigger member and the operating member and the paint controlling valve.

In testimony whereof, I have hereunto subscribed my name this 20th day of November, 1923.

FREDERICK W. SCHNEIDER. 

